<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <style>
        .active{
            border: 1px solid red;
        }
        .text-danger{
            color:red;
        }
    </style>
</head>
<body>
    <div id="app">
       
        <h1 v-if="awesome">if语句</h1>
        <div v-></div>
        <h1 v-else>else语句</h1>

    </div>    

    <script>
        var app = new Vue({
            el:"#app",
            data:{
                awesome:true,
              
            },
           
        });
    </script>
</body>
</html>
